@@ -38,0 +40,4 @@
+	persistentSessionsSubsection    = "persistent_sessions"
+	persistentStateSubsection       = "persistent_state"
+	notificationSubsection          = "notification"
+	localOverrideDatabaseSubsection = "local_override_database"

@@ -248,0 +254,4 @@
+
+const (
+	// PermDefault is a default permission bits for local override storage file.
+	PermDefault = 0o777

@@ -248,0 +294,4 @@
+// MaxBatchDelay returns the value of "max_batch_delay" config parameter.
+//
+// Returns 0 if the value is not a positive number.
+func (l LocalOverrideDatabaseConfig) MaxBatchDelay() time.Duration {

@@ -19,1 +23,3 @@
-		localChainStorage: make(map[cid.ID]engine.LocalOverrideEngine),
+var _ engine.LocalOverrideEngine = (*AccessPolicyEngine)(nil)
+
+func NewAccessPolicyEngine(opts ...func(ape *AccessPolicyEngine)) *AccessPolicyEngine {

@@ -20,0 +69,4 @@
+	return a.localOverrideDatabase
+}
+
+func WithChainRouter(router engine.ChainRouter) func(ape *AccessPolicyEngine) {

@@ -0,0 +122,4 @@
+		var value []byte
+		if value = cbucket.Get(k); value == nil {
+			chains := []*chain.Chain{c}
+			marshalled, err := json.Marshal(chains)

@@ -0,0 +141,4 @@
+			}
+		}
+		if !wasReplaced {
+			chains = append(chains, c)

@@ -0,0 +61,4 @@
+	}
+}
+
+func WithOpenFile(f func(string, int, fs.FileMode) (*os.File, error)) Option {

@@ -962,0 +976,4 @@
+
+	c.onShutdown(func() {
+		if err := ape.LocalOverrideDatabaseCore().Close(); err != nil {
+			c.log.Info(logs.FrostFSNodeAccessPolicyEngineClosingFailure,

@@ -20,0 +49,4 @@
+}
+
+func (a *accessPolicyEngine) MorphRuleChainStorage() engine.MorphRuleChainStorage {
+	a.mtx.Lock()

@@ -0,0 +143,4 @@
+		if err != nil {
+			return err
+		}
+		serializedChain = rbuck.Get([]byte(chainID))

@@ -53,1 +54,4 @@
 
+// LocalOverrideStorageDecorator interface provides methods to decorate LocalOverrideEngine
+// interface methods.
+type LocalOverrideStorageDecorator interface {

@@ -0,0 +179,4 @@
+			return err
+		}
+		return rbuck.ForEach(func(_, serializedChain []byte) error {
+			serializedChains = append(serializedChains, serializedChain)

@@ -963,0 +966,4 @@
+func initAccessPolicyEngine(_ context.Context, c *cfg) {
+	var localOverrideDB chainbase.LocalOverrideDatabase
+	if nodeconfig.PersistentPolicyRules(c.appCfg).Path() == "" {
+		localOverrideDB = chainbase.NewInmemoryLocalOverrideDatabase()